Which of the following is not an indication of tectonic activity?

the shapes of the continents and how they appear to be pieces of a jigsaw puzzle

similarities between fossils in locations now separated by sea

similarities in rock structures between the east coast of north america and the west coast of europe

similarities in vegetation between equatorial regions of different continents

Which element provides strength to the exoskeleton of clams and oysters

Which sequence correctly shows the path of carbon dioxide during repiration?

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.